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Huawei Certification
H19-308_V4.0 Exam
Huawei.H19-308_V4.0.v2026-09-23.q90 Dumps

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Question 81

Which of the following are differences between scale-out storage and array storage? (Select all that apply)

A.Large volume: 10 PB or more data
B.Performance: IOPS
C.Performance: TB-level bandwidth
D.Elastic scalability: thousands of nodes

Correct Answer: A,C,D

Huawei distinguishes Scale-out Storage (OceanStor Pacific) from traditional Array Storage (Centralized SAN/NAS) based on its ability to handle the "Yottabyte Era" requirements of mass data.
Large Volume (Option A): While traditional arrays are limited by the number of controllers and disk enclosures they can address, scale-out storage is designed to aggregate thousands of nodes into a single global namespace, easily managing 10 PB or even EB-level data volumes.
TB-level Bandwidth (Option C): Distributed storage excels at throughput. By utilizing a high-speed interconnected network (InfiniBand or RoCE) and parallel access protocols like DPC, a scale-out cluster can deliver aggregate bandwidth in the range of TB/s, which is critical for HPC and big data analytics.
Elastic Scalability (Option D): Traditional arrays typically scale out to a few dozen controllers. OceanStor Pacific can scale out to 4,096 nodes in a single cluster, providing linear growth in both performance and capacity as nodes are added.
Performance in IOPS (Option B) is not a difference in the sense that both systems provide IOPS; however, centralized all-flash arrays (Dorado) are often superior for low-latency, high-IOPS structured databases, whereas scale-out storage is primarily defined by its massive bandwidth and capacity scalability.

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Question 82

Which of the following are supported by OceanStor Dorado high-end models? (Select all that apply)

A.Tolerance of the failure of one controller enclosure
B.Symmetric active-active controllers
C.Smart disk enclosures
D.Automatic tiering between SSD and HDD

Correct Answer: A,B,C

Huawei OceanStor Dorado high-end models (such as the 18000 series) utilize the SmartMatrix 4.0 architecture to provide industry-leading resilience. Option A is correct because these models can tolerate the failure of an entire controller enclosure (containing 4 controllers) without interrupting services, as the other enclosure in the cluster continues to handle all I/O. Option B is correct because Dorado features a Symmetric Active-Active design where any LUN is not owned by a specific controller; instead, any controller in the cluster can directly access any LUN, eliminating the performance bottleneck caused by traditional ALUA (Asymmetric Logical Unit Access) and ensuring load balancing.
Option C is correct as Huawei employs Smart Disk Enclosures equipped with their own CPU and memory. These enclosures can offload tasks like data reconstruction (RAID rebuilds) from the main controllers, significantly speeding up recovery times and reducing the performance impact on host I/O during a disk failure. Option D is incorrect because OceanStor Dorado is an All-Flash array; it does not support HDDs and therefore does not perform tiering between flash and mechanical media (which is a function of the OceanStor Hybrid Flash series).

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Question 83

When RAID 5 is configured for the new-gen OceanStor hybrid storage, how many write penalties are generated in one full-stripe write operation?

A.2
B.4
C.0
D.1

Correct Answer: C

In Huawei OceanStor storage systems utilizing RAID 2.0+ and the SmartMatrix architecture, the "write penalty" associated with traditional RAID is mitigated through Full-Stripe Writes. In a partial write (where only some data in a stripe is updated), a RAID 5 setup usually suffers a write penalty of 4 (Reading old data, reading old parity, writing new data, writing new parity).
However, Huawei's controllers utilize a large cache to aggregate incoming data. When enough data is collected to fill an entire stripe (e.g., 8 data chunks plus 1 parity chunk in an 8+1 RAID 5 setup), the system performs a Full-Stripe Write. In this scenario, the system calculates the parity in the CPU/cache and writes the entire stripe to the disks at once. Since no old data or old parity needs to be read from the physical disks before writing, the disk-level write penalty is 0. This significantly enhances the write performance of hybrid arrays, especially those using mechanical HDDs which are highly sensitive to the latency of extra read/write operations.

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Question 84

Which statements about the copy protection (three copies) and EC technologies are correct?

A.Reconstruction is simpler for the copy technology than it is for the EC technology.
B.The EC technology provides high durability and high utilization, and is more cost-effective.
C.The copy technology provides high durability, but the space utilization is low.
D.The copy technology has higher computing requirements than the EC technology.

Correct Answer: A,B

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Question 85

What are the typical application scenarios for SAN storage? (Choose all that apply.)

A.Virtualization
B.Database
C.Just a Bundle Of Disks (JBOD)
D.File sharing

Correct Answer: A,B,D

SAN storage is typically used in scenarios such as virtualization (supporting virtual machines and environments), databases (providing high performance and reliability for transactional systems), and file sharing (enabling shared access to files across multiple servers). JBOD is not a typical SAN application; it refers to a simple array of disks without advanced storage features.

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